>Strong people are harder to kill

Is that actually so? Looking at US homicide statistics, over 75% of cases involve firearms. Would a bodybuilder have better chances of surviving a bullet wound?

Yes

you can be killed by ways other than homicide

What approaches do you have in mind? War? Government enforced famine? Selling me cheap cigarettes? Something else? And how much will bodybuilding help me avoid getting killed by these?

Falling down the stairs at 80 years old will kill someone who spent 80 years sedentary vs an 80 year old yoked grandpa

Fast people are harder to kill. Many short and fast people are fearsome opponents in karate kumite for example. Strong and big people are often also slow... but it depends on the motivation. Everybody can be killed in a lot of ways, sadly.

Most homicide victims are men and men are on average stronger than women so I seriously doubt that.

You need to compare the rates of success, not the absolute numbers. I bet there are more homicide attempts on men than there are homicide attempts on women.